DazukoFS 3.1.3 released

Hi,

I have decided to move 3.1.3 to the latest stable release. There was
an issue reported for 3.1.2, which has not been followed:

http://lists.gnu.org/archive/html/dazuko-help/2010-01/msg00003.html

It is not known if 3.1.3 also has this issue, but I assume it
does. Feedback, comments, and patches are welcome.

John Ogness

--

-- 
Dazuko Maintainer

container support in DazukoFS

[Cc: Eric Biederman because of his container feedback on LKML.
 Hi Eric, the Dazuko-Devel mailing list is register-only, but if you
 reply to me, then I can post your comments on the list.]

Hi,

I've been wondering what we could do to make DazukoFS more acceptable
for mainline inclusion. Aside from making DazukoFS more complete:

http://lists.gnu.org/archive/html/dazuko-devel/2010-06/msg00000.html

the main issue reported from LKML reviews was that we need to support
containers. I think I have a solution for this, which will also make
DazukoFS more flexible when not using containers.

My idea is the following:

1. There is only 1 global device "/dev/dazukofs.ctrl".

2. When a group is added (using the "add" or "addtrack" commands),
DazukoFS will create the "/dev/dazukofs.N" group device within the
container-space of the process adding the group. This means that
contained environments can create their own local group devices. For
systems not using containers this is also an improvement because it
means group devices are created dynamically (instead of the 10 static
groups that exist now).

3. When a process reads the global control device to see the group
names, only the groups within the same container-space as the reading
process are shown. This keeps information about other containers

Re: container support in DazukoFS

On 2010-07-03, ebiederm <at> xmission.com (Eric W. Biederman) wrote:
>> I've been wondering what we could do to make DazukoFS more acceptable
>> for mainline inclusion.
>>
>> [...]
>
> I just looked back at the reviews, and what I see is that your code
> essentially got the a brush off, as not really being worth
> reviewing.

I didn't get that impression. Especially since posting the patches led
to a relatively positive LWN.net article from Jake Edge.

> The comments were largely to point out giant design flaws in your
> approach to you, more than a serious hey this is a good idea, here a
> couple of little problems you need to fix to make it a good
> implementation.

The only giant design flaws that were discussed were related to
stackable filesystems in general and affect current mainline code
(eCryptfs) just as much as DazukoFS. Since eCryptfs also has these
issues and was accepted mainline, I did not view this as a reason to
reject DazukoFS.

As I stated in the original patch posts, one of the reasons for adding
another stackable filesystem to mainline would be to help identify
common functionality between the stackable filesystems. And then
together figure out how we can solve these problems, which currently
affect any stackable filesystem in Linux.

Patch 1/5

Hi all,

here are some patches against the recent stable dazukofs version (3.1.3).
Hope you find them useful.

Regards,
Lino Sanfilippo

Patch 1:
Implements the gettr() inode operation. This is for filesystems that 
implement
their own operation instead of using the generic one (like xfs).

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Patch 2/5

This patch enables behaviour compatible with BSD signal semantics by 
making the read() calls
on the dazukofs devices restartable across signals.

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Patch 3/5

This one disables seeking on the dazukofs devices, so one has not longer to
seek around after reading/writing on a dazukofs device.

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Patch 4/5

This patch fixes a missing cleanup in cases where an error occurs
after an event has already been assigned to a group.
Before an event has not been put back to the "todo" list properly
(the list_del() for the working list was missing) and also was not
put back in cases of error in dazukofs_group_read().

There is still something missing:
If a filedescriptor has already been opened for an event, it has to
be closed before it is put back to the "working list".
I will send a fix for this issue with another patch.

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Patch 5/5

This is a patch from Philipp Rosenberger.

It is not a bugfix but implements polling for dazukofs.
(Although I know that new features are not welcome until dazukofs
is mainline, this one might be useful).

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